Fastening device



July 16, 1946.

A. C. OLSEN n FASTENING DEVICE Filed' Dec. 8, 1944 @BY @h-z' -l ATTORNEY Patented July 16, 1946 EASTENING DEVIQE. Anders C'. Olsen, 'Forest Hills, N. Y; Annliootienleoombor 8, 1344, Seriol.l\9.=` 567,245..

4 Claims. (C1. Sai-b1) This invention relates toA fastening devices of the driven class. Qne adaptationof'the invention, is in building construction and', more particun larly, for securing flexible-type, Weatherproof covering materials, such asroofing .shingles and the like, to sheathing or other supporting surfaces of the. type4 characterized by a low degree of naileholding povven.

My invention is particularly concerned with the provision of a fastening device for use in W- cost building construction wherein flexible-type, weatherproof roofing or sidingisto be secured to sheathing of gypsumboard, fiber insulation board or other similar types, of protectiveY sheathing. generally possessing lownail-holding characteristics.

An object ofv the invention istoprovide a fastoning device for that purpose. which. will be of simple,y inexpensive, design and, will possess adequate holding power when driveninto sheathing materialsy of the above, described character. It is also an objectof the invention to, provide a fastener which. will be. highly efhcient in,y 5.6.-. curing flexible` and. frangible covering materials. to sheathing material of the character described,

" and which is designed to. off-enmaxmumresiste ance tothe tearing loose of. suchcoveringvmajterial under the stressof severe weather condi-V tions involving hignwinds, hail or driving, rainstorms.

A further object. of the inventionv is to provide a fasteningY device. of.. the Character indicated, which can be` easilyV handled and readily applied..

Other objects andv features ofthe invention willV be more clearly apparent from thev detailed description which is to,fol1ow and from the accompanying, drawing in which:

Figs. l and' 2 are. opposite perspective viewsof a fastening. deviceembodving the present. inven-v tion;

Fig. 3 isf enlarged elevation View of` theias.- toning device...

Figs. 4 and 5' are right and left hand views, respectively, ofthe device shown in Fig. 3:

Fig. t" is a fragmentary View iliustrotinsthe action of' the fastener in one,V application of; the present invention; Y

Fig.. 7 is. a view. similar to. Eig, .6.. showing. the. device. of the, presentinvention. in. its.. fnllv driven nositioniand Fig. 8. vis, a plan View ofthe .stripor blank., from which thev device of, the present invention, `is formed, with cut, and" folddinesf. indicated. thereon,

As distinguished from; thel'ordinary. wire nails or other naildike fasteners of the driven class, the fastening device o f-thepresentlinventionis formed from a flat nietal strip orblank shown Eig', 8. The, metal strip .or blank, designated ,by

the reference numeral' i0, may be cutfronfiA a` continuonsv ribbon intoA a' substantially rectangnlar. ooniig..trationY as Shown. and.. Stamped.' out. or otherwise `out. along.. the converging diagpnoi lines I'I; and. L3, n geeting` as at lil,` or ifW desiredi Connected bv o.. Snort horizontal out, to.v remove. thctriansiilnr niece, M'gdeiined thereby. The. thus Stamped.; Strip or. blank, l0. may be. then. folded, longitudinal'lv snbtantiallv alone the median. fold line. L5: extending. from.. the. Cntoiit. 'atr i2.; to. the. intersectionnoint. indicated. at. 1,6; t0' .foltxn the. inirtanosed but". separable legs.- comprising. the Shankt portion.v of tneiastener. Thel strin or. blank .lll is also. bent, oriolded., Substantially along. the lines lli and. i8.. inP a. direction.. toward. thei shank., ondv reversely alone.. the lines, liV and'. Zinwlierebv to form. the. heed.. portion. ottho .fastener Ivins. in. plane. whinn. extends/Substanz tially at. right angles, to.` ther plane. of. the portion.. r

in, thus forming thefastenins. devine, tnetr: angular web or hingenortions 2 L andl, rennen# tively defined, hv tin=,fol.dr o1"L bendlines, lle-.LSL

and Iii-20, aradonblesi, beneath, the head non. tion. on either side of. the. Shonlsasindfated. in

Figs.. 1-5.; andthevserveto reinioroe. thehead portion.. Withv this. arrangement, the, .outer straight.. edges 1?.. and.' 2.4. of. the. blank. form. the. inner edgesoi the-separable legs at a linear-posi: tion wllionissubstantiailv centrallyY located. 1th. respect. to, the, distanoe along the head. nortion betweenothe. pointY it and the.. opposite straight,

edg. 2.5. aniiithnsnraotioallv coincident, Witiithe vertical axisnf. the=head-nortion- Referring noW more particularly toFigs. 1^ and 2, the. reference. numeral.. 30.. designates, the. fas.- trlng, device of the-present inventionwhich. is formed from. flotl` metal Strip.- l0, as above, der, scribed.. As shown, the. fastener comprises a nailf like device having, a. head. portion` 35 and` a .shank`r portion 4.9., integral; therewith, As. previously.` infdicatedthe shanlcportionliesoin. a plane extend--. ing substantially marient-.angie to theheadnortionandoomnrises a pair of separablelegs #Land 42 connected. toeaon other along. theflongitudinal fold 45 and to the head portionA 3,5I by the Webs 2l. and.. 2.2 folded underneath thev headA portion and in, contact therewith,

As bestshown inligs,-` Zand 3.th'f identically beveled. legs 4 I. and. 4.2l taper from the lower ,end of the.longitudinal..fold.45E along their respectiveV sides Il and I3 to their respective pointed ends i 41 and 48. Thus, the pointed ends Y41 and 48 will be substantially centrally located relative to the perimeter 0f the head portion 35. ends 41 and 48 are dvergently bent from a point i along the shank 40 indicated by the numeral 49 which is preferablyat approximately the midpoint between the lower end ofthe fold 45 Vand the pointed ends 41, 48.

, In utilizing the above described fastener to Vsecure, for example, plies of exible roofing matey rialto a roof deck comprising reproof gypsumwNv board, as illustrated in Figs. 6 and '7, the fastener Y f is handled in the same manner as an ordinary` wire roofing nail and may be driven into the roofing and underlying sheathing with the Yaid Vofa` hammer. The pointed ends 41'and 48 ofA the separable, beveled legs 4| and 42 will, of course;y

readilypierce the flexiblev roofing plies 50 and 5| andk also pierce the frangible gypsum sheathing V52 lying underneath. As the fastener shank is driveninto the sheathingthe already divergent- 1y :bent legs 4I and 42 will continue to spread along divergent paths depicted in Fig. 6, until they` assume arpositionY approximately as indi-1 Y cated in Eig. '1.V When the fastener is driven fhomemso thaty the head 35fbears down against the outer ply 50 of the overlapped plies ofroofing,` the diverging coursestaken by the separating legs,

will resemble somewhat the illustration in Fig. '7.l

With the legs of the fastener shank'thus exey tending in arcuately divergentpaths within the VsheathingA board 52,' it would require a substan` tially greaterforce to render the fastener ineffective in securely holding the roof covering material 50 and 5|.to a roof deck than wouldV be re`v quired fin the -case of an ordinary wire roofing nail, Yor even one that was providedfwith abarbed shank, 4and especially'rwhen the roof deck is conf structed with gypsum or fiber insulation board or of the thus-*formed fastener .will preferably be,

the lower end of i terial'into which the fastener is driven.

In order to evaluate the holding power of my fasteners for comparison purposes, I used them -to fasten, inthe usual manner, two superposed Y layers of mineral surfaced roofing (weighing 90 pounds pervl Ysquare feet) to a gypsum roof deck'. The ends of the roofing strips were pulled until the roofing ripped around the head of one of the fasteners.` After'a number of tests, it was foundthat an average of about`45 poundswas required to rip the roofing, or'pull the fastener from the gypsum board. By way of comparison,.

` the ordinary 'M35' galvanizedV roongnail (3/8 some such material that is characteristically poor.

in nail-holding properties. invention provides a fastener for use with low Infact, the present t diameter head) required only slightly more than le pounds pulling force to remove it fro-m the same vconstruction of two layers of 90 pound mineral surfaced roofing secured to gypsum roof deck. 'y

VThe enhanced holding power obtained rbynemploying Ythe fastenersr of thepresent invention even Vexceeds the above-stated'average of about 40 pounds required to free twohlayers of 90 pound ,A roofing nailed .to a wood roof deck with standard 7/3 roofing nails. Then, too, these improved fasteners-can bev handled like nails, require no more careto their application than the ordinary nails, since they consistently drive well without bending or twisting, and are of such simple design as to permit rapid, large scale production at a cost which would not prohibit their use nplace of ordinary wire nails. Finally, the simple, im-

provedvfastener ofthe present invention enables nail-holding power materials that will require a pulling force about on a part with the force re- -quired to remove Va roofing nail from a roofydeck constructed vwith a material having high nail-1 holding characteristics, such as wood.

'Another important factor to be considered in designing .fasteners thati will be efficient in sev curing a'fiexible type roofing material to a roof deck is the stressY and strain imposed on the roof covering and the fasteners therefor -by severe driving rainstorms.V Under such conditions, there` is Va tendency -for the fieXible roofing to'beY lifted up against theheads of the nails orY other type vfasteners .holding the roofing in place and, unless these heads are, each wide enough to provide a reasonable amount of bearing surface, the roofing ofttimes will be torn and ripped away from the fastener head. By forming the fastener of the Present invention from a metal strip of any desired width', therermay be provided a fastener head which has suicient .bearing surface to avoid the Vaforementioned danger. In the case of Ythe ordinary wire nail, or flat-headed wire staple, on the other hand, the sizeof the head is necessarily limited to the largest diameter of f wire used in making the fastener. .y

one practical embodiment ofmy invention,

I Ymay form a fastener'of the aboveA described character from Yan V18, gauge flat strip Vof hot.

weather conditionsl involving high winds, hail or rolled, annealed sheetsteelhaVng dimenSOns Of f say 1/2" r11/rf. Inthis instanee;thebeve1ed1egs 'i5 thelconstruction ofrbuildings having insulated., reproof'and,weatherproof roofs and side walls where it is desired to employ relatively inexpensive Vflexible orgenerally frangiblertype covering material ,inconjunction with sheathing or roof decking of the character possessing low nailyholding power.

While I havev particularly described my fastener as being adapted for use in theaforedescribed type of Vbuilding construction, it willbe understood that this form of fastener is also'capable of being enicientlyV used in vother type of,v construction, such as furniture, vehicles, toys'or the like,'where sheet material is vto be secured to alsupporting base possessing a degree of nailholding `power ranging from the low nail- Vholding power of materials on the'order of insulation boardv to the high nail-holding power of wood, and may also be used for securing sheet material to wood in building construction.

I claim: Y

1.'.A fastening device fabricated from a'fiatV Y metal strip bent at one end to provide a head portioncand folded longitudinally to yprovide a shank portion lying in a planeat a right angle to the plane of thehead portion, said shank portion comprising'legs juxtaposed for a substantial distance Yalong their length, said legs being connected togetherl for a distance along the longi-4 tudinal fold and terminating' in divergently-bent points whereby sai'dV legs are adaptedt'o diverge when forced into fastening position.

metal strip bent at one end to provide a head p or t tion and folded longitudinally to provide a shank portion lying in a plane at a right angle to the plane of the head portion, said shank portion comprising legs connected together for a distance along the longitudinal fold, said legs having pointed ends and being tapered between said connection and said pointed ends and being adapted to diverge when forced into fastening position.

3. A fastening device adapted to be driven, said .device being fabricated from a iiat metal strip bent at one end to provide a head portion and folded longitudinally to provide a shank portion lying in a plane at a right angle to the plane of the head portion, said shank portion comprising legs connected together for a distance along the longitudinal fold, said legs having divergentlybent pointed ends and being tapered between said connection and said pointed ends and being adapted to diverge when the fastening device is driven, said pointed ends being centrally located with respect to the head portion.

` 4. A fastening device adapted to be driven, said device being fabricated from a flat metal strip bent at one end to provide a head portion and folded longitudinally to provide a shank portion lying in a plane at a right angle t0 the plane of the head portion, said shank portion Acomprising legs joined together and to the head portion along the fold, said legs being beveled diagonally from the end of the fold to divergently-bent pointed ends and adapted to diverge when the fastening device is driven, said pointed ends lying in a plane approximately common to the plane of the longitudinal axis of the head portion.

ANDERS C. OLSEN. 

